Instruction manual

Connection box C-BOX 300
Safety precautions
S
ubject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
P
epperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
Date od issue 08/15/2003
6
When connecting up the C-BOX 300, it is recommended to observe the guidelines in
the VDE 0100 regulations for handling electrical equipment.
Bus connectors It is recommended t o use only commercially available
PROFIBUS connectors for connecting the bus.
Cable shield Shielded cables are less sensitive to interference due to
electromagnetic fields. With shielded cables, the interfe-
rence currents are led to ground through the shielding rail,
which is electrically connected to the case. To ensure that
the interference currents which flow through the shielding
do not themselves interfere with other devices, it is impor-
tant to provide a low impedance connection to the protec-
tive ground. Observe the following rules for the shields of
the PROFIBUS cable and the ser ial interface cable:
• The braiding of the shielding should have a degree
of coverage of more than 80%.
• The shielding should include a braided shield and
should not consist solely of foil shielding, since the
latter can be easily damaged by cable tension and
pressure.
• To ensure good immunity to interference at high fre-
quencies as well, the shielding of the cable should
be attached to the shielding rail at both ends of the
cable.